Improved screw-propeller



UNITED STATES PATENT OFFICE.

J. J. E. VEEGNE, or rAErs, FRANCE.

lIVIPROVED SCREW-PROPELLER.

To all whom, it may concern,.-

Be it known that I, JULES JEAN BAPTISTE VERGINE, of Paris, and nowresiding at rI`oulon, in the Empire of France, ofiicer'in the Imperialnavy, have invented an Improvement in Screw-Propellers; and I do herebydeclare that the following is afull, clear, and exact description of thesaine, reference being had to the annexed sheet of drawings, making apart of the same.

My invention relates to improvements in screw-propellers for vessels7which improvements are intended to prevent the molecules of water struckby the screw from passing toward the periphery by yielding to thecentrifugal force and from producing pre] udical eddies. I obtain theseresults by means of grooving or iiuting the surface of the screw,instead of using a plain surface, as usual. By fluting the surface ofthe screw 7 I mean making grooves in the body of the metal; or thegrooved surfaces may be produced by means of raised ribs affixed to thescrew-surface, which ribs may be either inclined or curved. toward thecenter of the screw, or the reverse, or stand at right angles to theface of the screw. I form these grooves on the surface of the screw,either in the direction in which the screw is generated, or they may beat angles or inclined thereto, as may be most desirable.

My invention consists in arranging the grooving, fluting, or ribs in theform of a series of steps rising one above the other as they approachfrom the center toward the periphery. By this arrangement all the ribsare made to act in the most effective manner upon the water, anymolecules that pass one rib being caught by the next higher ribadjoining, and so on from the center of the propeller to the periphery,the outer rib being the highestof all.

I will now proceed to describe my invention in detail, reference beinghad to the annexed sheet of drawings, and to the letters marked thereon,in which- Figure l shows a side view of the screwpro peller providedwith the grooves or iiutings. Fig. 2 represents a Vertical projection orplan of the same perpendicular to the axis of the shaft. This screw,which in the said figure is represented with two branches, may of coursebe provided with three, four, or six branches having a certain number ofgrooves or iutings.

Fig. 3 is the section through a plan perpendicular to the axis of theshaft, showing the two branches of .the screw and the form of thegrooves or iiutings. Fig. 4 is the horizontal projection of the screw.through a plane parallel to the axis ofthe shaft. Fig. 5 is a section ofthe groove or fluting through the line a b of Fig. 2. Fig. 6 is asect-ion of the samethrough the line cd of Fig. 2. Fig. 7 shows asectional Y view of the same through m n of the said fig- J. J. E.VEEGNE.

IVitnesses:

TAUDEIA, GARDIssAL;

